Three-dimensional imaging method for three-dimensional imaging system with cylindrical array surface

Abstract

The invention relates to a three-dimensional imaging method for a three-dimensional imaging system with a cylindrical array surface, which includes: placing a metal cylinder with a smooth surface at the coaxial center of the cylindrical array surface of the system before powering on the system; powering on N transmitting antenna units to sequentially transmit radio frequency signals to the surface of the metal cylinder and to be reflected by a mirror; receiving echo signals and transmitting the echo signals to an echo signal receiving and processing device by the aid of corresponding receiving antenna units to process the echo signals and then transmit the echo signals to a signal processor; processing all the echo signals after receiving and digitally sampling all the echo signals by theaid of the signal processor to obtain and store five groups of correction parameters; taking out the metal cylinder, transmitting a target object to a scanning position, starting scanning and transmitting echo signals; and correcting scanning echo signal data by using the five groups of correction parameters, imaging the corrected scanning echo signal data by a known three-dimensional imaging method and then displaying images on a screen by the aid of the signal processor.

Description

technical field [0001] The patent of the present invention relates to the field of three-dimensional imaging, and specifically relates to a three-dimensional imaging method of a cylindrical array three-dimensional imaging system. Background technique [0002] With the development of science and technology, humans have developed many new means of transportation, such as airplanes, high-speed trains, subways, etc. These means of transportation carry a large number of people. Once dangerous goods enter the means of transportation, it is very easy to bring safety hazards. Threat to the lives of those around you. For example, carrying flammable and explosive items into the plane or subway, etc. [0003] In addition, as human social activities become more and more extensive, large-scale gatherings are often held, and these large-scale gatherings often gather tens of thousands of people. Once someone enters with dangerous objects or terrorists enter with explosives to carry out t...

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Problems solved by technology

[0006] The first method is not suitable for engineering applications, and regardless of the second or third method above, the amplitude-frequency consistency of the large-bandwidth signal and the linearity of the signal are non-ideal, that is, there is poor linearity of the chirp signal 1. Single-channel amplitude-frequency error; due to the use of multiple transceiver channels, the amplitude of echo signals between different channels is inconsistent, and the delay time of different channels is inconsistent, resulting in echo frequency deviation and phase error. If these problems are not resolved, the imaging quality will be seriously affected.

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